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HBD Commissioning

HBD Commissioning. Progress from October 3 to November 28, 2006. Itzhak Tserruya DC meeting, BNL December 13, 2006. Done or almost done. in progress. to be done. Pre-beam commissioning (I). Present status: the two detectors installed

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HBD Commissioning

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  1. HBD Commissioning Progress from October 3 to November 28, 2006 Itzhak Tserruya DC meeting, BNL December 13, 2006

  2. Done or almost done • in progress • to be done Pre-beam commissioning (I) • Present status: • the two detectors installed • all cables (signal, HV and LV) tested, installed and connected • CF4 gas recirculation system operational but still on commissioning phase • UV lamp for CsI QE monitoring installed and operational, procedure being optimized • Heating and cooling systems almost ready (waiting for blowers) • CF4 gas monitoring system – expected to be installed this week

  3. Both detectors installed HBD East (back side) Installed 10/19/06 HBD West (front side) Installed 9/4/06

  4. Water inside HBD Room temperature ≈ 20 deg. Flow: Ar 3l/min

  5. Relative CsI QE monitoring • October 17, 18: East measured at SUNY with Ar • December 4: East and West measured at BNL with Ar • December 8: East and West measured at BNL with CF4 • Finding: • - East @BNL = East @ SUNY • East very similar to West • Values in CF4 ≈ 2 x Values in Ar • Very encouraging. A new set of measurements under better and more reproducible conditions is planned to serve for long term reference

  6. Done or almost done • in progress • to be done Pre-beam commissioning (II) • HV system: • All six HV PS units tested • 500 V on each module • operational voltage on each module: The LeCroy HV PS does not offer enough protection. We are developing and testing a safe procedure to go to operating voltage. Powering scheme: 2 HV PS one for the mesh and one for the triple GEM stack through a 3 branch resistive chain. (across the GEMs there is only one resistor R2 and not two as in this diagram).

  7. Done or almost done • in progress • to be done Pre-beam commissioning (III) • Detector readout: • Readout electronics delivered, operational and ready to take data in stand-alone mode. • noise optimization • dead channel count • pedestal runs done routinely • timing and data taking with pulser done routinely • ADC charge calibration for all detector modules • first order zero suppression -- Chi

  8. Examples of raw data 12x16 ns sample TDC signal S(8+9+10)/3 – S(0)

  9. Mean - West Black: double peaks Blue: large pads at detector edge

  10. Mean - East Black: double peaks Blue: large pads at detector edge

  11. Sigma - West Black: double peaks Blue: large pads at detector edge

  12. Sigma - East Black: double peaks Blue: large pads at detector edge

  13. Summary • Noise level is excellent:  ~ 2 ADC counts  3 ~ 6 ADC counts 0.6 fC  0.37 e at a gain of 104 • Channels without signal: 28 in total  solved • Channels with double peaks: 18 in total • Channels with low signal: 4 in total Remaining problems in less than 1% of all channels! (Origin under study. Suspicion that double peaks are due to saturated pulses.)

  14. Done or almost done • in progress • to be done Pre-beam commissioning (IV) • Monte Carlo simulations • basic geometry and materials in • reconstruction up to the pad response • 3d field map in +- configuration • look up table • cluster reconstruction and cluster splitting • tracking central arm to HBD

  15. HBD in PISA Hits per sector X-Y hits Z-Y Hits

  16. Number of detected Cherenkov photons per electron

  17. Event Display - Clusters

  18. Pre-beam commissioning (V) • HBD online monitoring: • Event display: pad response • Event display: cluster response • Pulse height distribution of a detector module • Pad frequency vs. pad number • Cluster size distribution • Cluster pulse height distribution HBD trigger • First discussions started Very good progress over the last two months (in spite of QM) and we still have about 6 weeks to complete this program before we see collisions. I think this is doable.

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